/// <summary>
/// The <see cref="MainPageViewModel.PropertyChanged"/> event handler.
/// </summary>
/// <param name="sender">Event sender.</param>
/// <param name="e">The <see cref="PropertyChangingEventArgs"/> instance containing the event data.</param>
private void ViewModelOnPropertyChanged(object sender, PropertyChangedEventArgs e)
{
DispatcherHelper.InvokeOnUIThread(() =>
{
switch (e.PropertyName)
{
case MainPageViewModel.StatePropertyName:
this.SetChromeVisibility(this.viewModel.State == MainPageViewModelState.Loaded);
this.UpdateApplicationBarState();
break;
case MainPageViewModel.ItemsPropertyName:
if (this.viewModel.Items != null)
{
this.viewModel.Items.CollectionChanged += this.ViewModelOnItemsCollectionChanged;
}
break;
case MainPageViewModel.CameraTypePropertyName:
if (this.viewfinder != null)
{
this.viewfinder.CameraType = this.viewModel.CameraType;
}
this.UpdateApplicationBarState();
break;
case MainPageViewModel.FlashModePropertyName:
if (this.viewfinder != null)
{
string message = string.Empty;
switch (this.viewModel.FlashMode)
{
case FlashMode.Off:
message = AppResources.FlashOffTextLabel;
break;
case FlashMode.On:
message = AppResources.FlashOnTextLabel;
break;
case FlashMode.Auto:
message = AppResources.FlashAutoTextLabel;
break;
}
this.viewfinder.ShowStatusMessage(message);
}
this.UpdateApplicationBarState();
break;
case MainPageViewModel.CaptureModePropertyName:
if (this.viewfinder != null)
{
string message = string.Empty;
switch (this.viewModel.CaptureMode)
{
case CaptureMode.LowLag:
message = AppResources.LowLagTextLabel;
break;
case CaptureMode.Variable:
message = AppResources.VariableTextLabel;
break;
}
this.viewfinder.ShowStatusMessage(message);
}
this.UpdateApplicationBarState();
break;
case MainPageViewModel.PreviewBrushPropertyName:
if (this.viewfinder != null)
{
this.viewfinder.PreviewBrush = this.viewModel.PreviewBrush;
}
break;
case MainPageViewModel.PreviewSizePropertyName:
if (this.viewfinder != null)
{
double max = Math.Max(this.viewModel.PreviewSize.Width, this.viewModel.PreviewSize.Height);
double min = Math.Min(this.viewModel.PreviewSize.Width, this.viewModel.PreviewSize.Height);
if (OrientationHelper.IsPortrait(this.Orientation))
{
this.viewfinder.PreviewHeight = max;
this.viewfinder.PreviewWidth = min;
}
else
{
this.viewfinder.PreviewHeight = min;
this.viewfinder.PreviewWidth = max;
}
}
break;
case MainPageViewModel.ReviewImageBrushPropertyName:
if (this.viewfinder != null)
{
// If your application captures video and needs to slide the last
// video frame, please, refer to the Viewfinder.GetPreviewSnapshot method.
this.viewfinder.ReviewImageBrush = this.viewModel.ReviewImageBrush;
this.viewfinder.SlideReviewImage();
}
break;
}
});
}